U.S. patent application number 11/518100 was filed with the patent office on 2007-05-03 for flat panel display having enhanced thermal dissipation uniformity.
Invention is credited to Young Kil Choi.
Application Number | 20070097285 11/518100 |
Document ID | / |
Family ID | 37995780 |
Filed Date | 2007-05-03 |
United States Patent
Application |
20070097285 |
Kind Code |
A1 |
Choi; Young Kil |
May 3, 2007 |
Flat panel display having enhanced thermal dissipation
uniformity
Abstract
A flat panel display is provided having enhanced thermal
dissipation uniformity. The flat panel display includes an image
display panel wherein a first substrate is spaced apart from a
second substrate. A transparent conductive film is formed on the
front side of the image display panel. A chassis member is
positioned on the rear side of the image display panel. A
conductive member connects the transparent conductive film and the
chassis member.
Inventors: |
Choi; Young Kil; (Yongin,
KR) |
Correspondence
Address: |
CHRISTIE, PARKER & HALE, LLP
PO BOX 7068
PASADENA
CA
91109-7068
US
|
Family ID: |
37995780 |
Appl. No.: |
11/518100 |
Filed: |
September 8, 2006 |
Current U.S.
Class: |
349/58 |
Current CPC
Class: |
G02F 1/133385 20130101;
H01L 51/529 20130101; G02F 1/133308 20130101; G02F 1/133317
20210101; G02F 2201/50 20130101 |
Class at
Publication: |
349/058 |
International
Class: |
G02F 1/1333 20060101
G02F001/1333 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 2, 2005 |
KR |
2005-104637 |
Claims
1. A flat panel display having enhanced thermal dissipation
uniformity comprising: an image display panel having a first
substrate spaced apart from a second substrate; a transparent
conductive film formed on a front side of the image display panel;
a chassis member positioned on a rear side of the image display
panel; and a conductive member connecting the transparent
conductive film and the chassis member.
2. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein the transparent conductive film is
located on the front side of the second substrate and is coated
with a conductive substance.
3. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein the transparent conductive film is a
thermal conductive substance.
4. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein the chassis is a conductive
metal.
5. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein the conductive member is a
conductive tape.
6. The flat panel display having enhanced thermal dissipation
uniformity of claim 5, wherein the conductive member is a copper
substance.
7. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein the conductive member is formed in
an edge area of the front, side, and rear of the image display
panel to connect the chassis member with the transparent conductive
film.
8. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein the transparent conductive film is
adapted to conduct heat to the chassis member through the
conductive member.
9. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein the image display panel includes: a
first substrate having an electron emission device in an area
defined by an intersection of a cathode electrode direction and a
gate electrode direction; a second substrate displaying an image by
means of the electron emitted from the electron emission device of
the first substrate; and supporting means between the first
substrate and second substrate for supporting the first substrate
and the second substrate and maintaining a vacuum state between the
first substrate and the second substrate.
10. The flat panel display having enhanced thermal dissipation
uniformity of claim 1, wherein a data driver and a scan driver for
providing signals are positioned on the rear side of the image
display panel.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to and the benefit of
Korean Patent Application No. 2005-0104637, filed on Nov. 2, 2005,
in the Korean Intellectual Property Office, the entire content of
which is incorporated herein by reference.
BACKGROUND
[0002] 1. Field of the Invention
[0003] The present invention relates to a flat panel display, and
more particularly to a flat panel display having enhanced thermal
dissipation uniformity.
[0004] 2. Discussion of Related Art
[0005] Flat panel displays such as a liquid crystal display (LCD),
a plasma display panel (PDP) and, in particular, an electron
emission display (EED) have been developed and put to practical
use.
[0006] The EED has been highlighted as a promising next generation
display with regard to view angle, high speed response, high
brightness, high definition and thinness.
[0007] The EED is typically formed of in triode structure having a
cathode electrode, an anode electrode and a gate electrode. More
specifically, the cathode electrode being commonly used as a scan
electrode is formed on a substrate, and an insulating layer with a
hole and the gate electrode being commonly used as a data electrode
are stacked on the cathode electrode. An emitter, which is an
electron emission source, is formed inside of the hole to contact
with the cathode electrode.
[0008] In general, the EED has schemes of using a hot cathode and a
cold cathode as an electron source. As the electron emission device
using the schemes of the cold cathode, the types of a filed emitter
array (FEA), a surface conduction emitter (SCE), a
metal-insulator-metal (MIM), a metal-insulator-semiconductor (MIS)
and a ballistic electron surface emitting (BSE) have been
known.
[0009] The EED typically emits electrons by means of a quantum
mechanical tunnel effect by concentrating high electric field on
the emitter and accelerates the electrons emitted from the emitter
by voltage applied between the cathode electrode and the anode
electrode to collide with a red, green, blue (RGB) phosphor layer
formed on the anode electrode, light-emitting the phosphor and
displaying an image.
[0010] FIG. 1 is an exploded schematic perspective view showing a
conventional flat panel display and FIG. 2 is a cross sectional
view of the flat panel display taken along line I-I' in FIG. 1. The
conventional flat panel display 100 includes an image display panel
120 wherein a first substrate 121 is spaced apart from a second
substrate 122. A chassis member 130 is provided at a rear side of
the image display panel 120. A bottom cover 110 surrounds the rear
side of the chassis member 130 and sides of the image display panel
120. A top cover 140 fixes a corner portion of a front side and is
coupled to the bottom cover 110.
[0011] In the image display panel 120, the first substrate 121,
which is an electron emission substrate, is spaced apart from the
second substrate 122, which is an image forming substrate. A vacuum
state is maintained between the first substrate 121 and the second
substrate 122. A supporting member 123 is included between and
supports the first substrate 121 and second substrate 122.
[0012] In the image display panel 120 a data driver 124a provides a
data signal and a scan driver 124b provides a scan signal,
respectively.
[0013] Significant heat is generated from the data driver 124a and
the scan driver 124b when providing signals to the image display
panel 120, due to a significant amount of current. The entire
temperature of the panel rises as a result of the generated
heat.
[0014] Heat generated during the driving of the image display panel
120 is dissipated by means of the chassis member 130 provided on
the rear side.
[0015] However, when the chassis member 130 contacts only the rear
side of the second substrate of the image display panel to reduce
the temperature of the second substrate and, due to the typical
rigidity of a spacer between the first substrate and the second
substrate, non-uniformity in the temperature between the first
substrate and the second substrate can result, and, in turn, cause
distortion of the emission beam. The phosphor around the spacer
then fails to light-emit uniformly, resulting in poor image
display.
SUMMARY OF THE INVENTION
[0016] In accordance with the present invention a flat panel
display is provided having enhanced thermal dissipation
uniformity.
[0017] In an exemplary embodiment a flat panel display includes an
image display panel wherein a first substrate is spaced apart from
a second substrate. A transparent conductive film is formed on the
front side of the image display panel. A chassis member is
positioned on the rear side of the image display panel. A
conductive member connects the transparent conductive film and the
chassis member.
[0018] The transparent conductive film on the front side of the
second substrate may be coated with a conductive substance and may
be formed of a thermal conductive substance to conduct heat to the
chassis member through the conductive member.
[0019] The conductive member may be formed in a conductive tape of
copper substance and may be formed in at edge areas of the front,
side and rear of the image display panel to connect the chassis
member with the transparent conductive film.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is an exploded schematic perspective view showing the
constitution of a conventional flat panel display.
[0021] FIG. 2 is a cross sectional view of the flat panel display
taken along line I-I' in FIG. 1.
[0022] FIG. 3 is an exploded schematic perspective view showing the
constitution of a flat panel display having enhanced thermal
dissipation uniformity according to the present invention.
[0023] FIG. 4 is a cross sectional view of the flat panel display
taken along line II-II' in FIG. 3.
[0024] FIG. 5 is a cross sectional view schematically showing the
structure of the image display panel in FIG. 4.
DETAILED DESCRIPTION
[0025] Referring to FIGS. 3 and 4, a flat panel display 300 having
enhanced thermal dissipation uniformity according to the present
invention includes an image display panel 320 wherein a first
substrate 321 is spaced apart from a second substrate 322. A
transparent conductive film 350 is formed on the front side of the
image display panel. A chassis member 330 is positioned on the rear
side of the image display panel 320. A conductive member 360
connects the transparent conductive film 350 and the chassis member
330.
[0026] In an exemplary embodiment, a bottom cover 310 fixes and
surrounds the rear side and the outer portion of the image display
panel 320 and a top cover 340 surrounds a front outer portion of
the image display panel 320.
[0027] Referring now to FIG. 5, in the image display panel 320 the
first substrate 321, which is an electron emission substrate, is
spaced apart from the second substrate 322, which is an image
forming substrate. A vacuum state is maintained between the first
substrate 321 and the second substrate 322. A supporting member 323
is included between and supports the first substrate 321 and the
second substrate 322.
[0028] In the image display panel 320, panel drivers include a data
driver 324a and a scan driver 324b which respectively provide a
data signal and a scan signal.
[0029] More specifically, the first substrate 321, which is an
electron emission substrate of the image display panel 320, forms a
cathode electrode 521 on a transparent substrate 520 in a
predetermined shape, such as a stripe shape. The electron emission
device includes an electron emitter 522 in the area where the
direction of cathode electrode 521 intersects with the direction of
gate electrode 524. Indium tin oxide (ITO) may be used for the
cathode electrode 521.
[0030] An insulating layer 523, which is formed on the upper part
of the substrate 520 and the cathode electrode 521, electrically
insulates the cathode electrode 521 and the gate electrode 524. The
insulating layer 523 includes at least one first hole 525 on the
intersecting area of the cathode electrodes 521 and the gate
electrodes 524 so that the cathode electrode 521 is exposed.
[0031] The gate electrodes 524 are arranged on the insulating layer
523 in a predetermined shape, for example, a stripe shape, in the
direction of intersecting with the cathode electrode 521 to provide
respective data signal or scan signal applied from a data electrode
driver or a scan electrode driver to each electron emission device.
The gate electrode 524 includes at least one second hole 535
corresponding to the first hole so that the electron emitter 522 is
exposed.
[0032] The second substrate 322, which is an image forming
substrate, includes: a transparent substrate 510, an anode
electrode 511 formed on the upper part of the transparent substrate
510, a phosphor 512 light-emitted by the electron emitted from an
electron emitter 522 on the upper part of the anode electrode 511,
and an optical shielding film formed between the phosphors 512.
[0033] The image display panel 320 is maintained in a vacuum state
by sealing the first substrate 321 and the second substrate 322 and
includes supporting means 323 for separating apart and supporting
the two substrates 321, 322.
[0034] Also, an internal vacuum space between the first substrate
321 and the second substrate 322 is provided with the supporting
means 323 for withstanding atmospheric pressure applied from the
outside of the image display 300. A spacer 530 further maintains
and supports the space. One end of the spacer 530 contacts with the
upper part of the optical shielding film 513 and the other end
contacts with the upper part of the insulating layer 523.
[0035] Although the image display panel 320 gives an example of an
upper gate structure as an electron emission device, it is not
limited thereto. Various structures including a lower gate
structure and a double gate structure are available as the
structure for emitting an electron.
[0036] In the image display panel 320, positive (+) voltage is
applied to the cathode electrode 521 of the image display panel,
negative (-) voltage is applied to the gate electrode 524 and
positive voltage (+) is applied to the optical shielding film 513,
from a power source. Thereby, an electric field is formed around
the electron emitter 522 by means of a voltage difference between
the cathode electrode 521 and the gate electrode 524 to emit
electrons, and the emitted electrons are induced by high voltage
applied to the anode electrode 511 to collide with the phosphor
area 512 of the corresponding pixel, implementing gray scale of the
image.
[0037] In the image display panel constituted as described above
respective data driver 324a, and scan driver 324b provide a data
signal and a scan signal. Data driver 324a and scan driver 324b are
positioned on the rear side of the image display panel 320. The
heat generated from data driver 324a and scan driver 324b is
transferred through the supporting means 323, raising the entire
temperature of the image display panel 320.
[0038] Therefore, in order to dissipate the heat of the image
display panel 320, a chassis member is provided on the rear side of
the image display panel 320.
[0039] More specifically, the chassis member 330 is formed of metal
substance with excellent thermal conductivity, and is provided on
the lower end of the panel drivers (data driver and scan driver
324a, 324b) positioned on the rear side of the image display panel
320. The chassis member 330, which is provided in approximately the
same size as the image display panel 320, receives entire heat from
the image display panel 320. Since the panel drivers (data driver
324a and scan driver 324b) directly contact the chassis member 330,
the heat generated from the panel drivers can be directly
transferred to the chassis member 330, reducing the heat
transferred to the image display panel 320.
[0040] The transparent conductive film 350 on the front side of the
second substrate of the image display panel may be coated with a
transparent conductive substance and may be formed of a substance
with excellent thermal conductivity
[0041] The conductive member 360 may be formed as a conductive tape
of a copper substance and is formed in a edge area of the side,
front side and rear side of the image display panel to connect the
chassis member 330 with the transparent conductive film 350
[0042] The transparent conductive film 350 conducts the heat on the
front side of the image display panel through the chassis member
330 which is positioned on the rear side thereof by means of the
conductive member 360, reducing the difference of the entire
temperature of the image display panel.
[0043] Therefore, by uniformly maintaining the temperature of the
image display panel, distortion of the emission beam, failure of
uniform light-emitting of the phosphor around the spacer and
resulting poor image display can all be prevented.
[0044] Bottom cover 310 is formed of aluminum material and
surrounds the bottom and sides of the image display panel.
[0045] The top cover 340 is engaged with the bottom cover 310 by
bending a predetermined edge area in order to secure together the
flat panel display 300.
[0046] Although exemplary embodiments of the present invention have
been shown and described, those skilled in the art would appreciate
that changes may be made to the embodiments without departing from
the principles and spirit of the invention, the scope of which is
defined in the claims and their equivalents.
* * * * *